Lecture 4: Weathering and Mass Wasting
Lecture 4: Weathering and Mass Wasting
Lecture 4: Weathering and Mass Wasting
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<strong>Weathering</strong>• Chemical <strong>Weathering</strong>– Hydration: chemical reaction that consumes H 2 O [ 2KAlSi 3 O 8 +2H 2 CO 3 + H 2 O = Al 2 Si 2 O 5 (OH) 4 + 4SiO 2 + 2K + +2HCO 3- ]– Oxidation: chemical reaction that consumes oxygen [ Fe 2 SiO 4 +½O 2 = Fe 2 O 3 + SiO 2 ]– Dissolution: dissolving of minerals into solution [ NaCl + H 2 O =Na + + OH - + H + + Cl - ]• Physical <strong>Weathering</strong>– Ice wedging– Thermal stress– Spheroidal weathering– Biologic activity– Soil creep– Solifluction– Exfoliation
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